I thought so too (disservice is a bit strong though). When I talked to various physics professors, they made it seem like fluid mechanics was fairly easy to pick up and was really just "applied mechanics". I know they have to use some fluid mechanics (in plasmas for example), so I figure they semi-know what they're talking about.
@OP: you might want to narrow your choice of engr fields down a bit. EE classes on semiconductors/electronics would be useful if you go that route, but if you go want to do aerospace design, those classes may not be as useful...
you might do better finding out what interests you as oppose to what the world wants. there are plenty of jobs involving electronics/circuits, but you may find you can't stand that stuff (I know I can't).